Journal of Research of the National Bureau of Standards
AbstractGlass apparatus is described for the purification and growth of crystals with melting points up to about 130 �C by a modified Bridgman technique. The temperatures of the melt and the solid are maintained by two immiscible liquids at whose interface a sharp temperature drop exists. A sealed Pyrex tube containing the specimen is slowly lowered through the interface. The specimen is maintained under its own vapor pressure in contact only with the glass container. Provision is made for the removal of the last portions of the specimen to solidify from each of several successive recrystallizations. The equipment has been found effective for the purification of trans-stilbene, dimethyl oxalate, benzoic acid, and benzene. It could also be used for careful studies of thermal and radiation stability of pure substances.
CiteJ. Res. Nat. Bur. Stand. Sec. C: Eng. Inst., Vol. 69C, No. 3, p. 195
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